The recall involves Wawona Packing Orchard Perfect Brand peaches, nectarines, plums and pluots bought June 1 to July 12 that may have been exposed to Listeria.

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The fruit was sold nationwide at Costco, Walmart, Whole Foods and Trader Joes.

Angela Shaw is a an assistant professor of food science and human nutrition.

"This is not something where you can wash the fruit and get rid of the bacteria," Shaw said in a news release. "My message to everyone is to discard the peaches bought between June 1 and July 20. The risk is too high."